This Universal Stopper is a clear, waterproof Type 4X (Type rating pending) cover with a white horn housing, alarm, enclosed backbox and open mounting plate. Cover is designed to comply with ADA and is less than 4 inches in depth. Other mounting options include a surface or flush mount cover. The cover is also available without a horn housing or message hood. Universal Stopper has the same footprint as the Mini Stopper , but has a larger interior and can accommodate most dual action pull stations.